Originally Posted by
LoganFlyer
Absolutely no problem at all. You're buying the first EU-US leg, and then a bunch of US-EU-US round trips that aren't nested inside each other. This doesn't break any rules that I know of.
Such nesting can be an issue with revenue fares if it is used to get around min-stay/Sat night stay rules to get cheaper fares. This generally only occurs when you are doing short weekly flights to a destination (with Su - Th or Mo - Fr stays). Such nesting is prohibited in the CoC. Probably not an issue with award fares (although there are some with min stay requirements now).